Final answer:
The primary duty of the triage division is to establish zones for categorized patients based on the severity of their condition.
Step-by-step explanation:
The primary duty of the triage division is to establish zones for categorized patients. Triage is a process used in emergency settings to prioritize patients based on the severity of their condition. By establishing zones for categorized patients, the triage division ensures that those who are most critically injured or ill receive immediate attention and care. This helps in efficient allocation of resources and saves lives.